1# SPDX-License-Identifier: GPL-2.0 2%YAML 1.2 3--- 4$id: http://devicetree.org/schemas/dma/dma-common.yaml# 5$schema: http://devicetree.org/meta-schemas/core.yaml# 6 7title: DMA Engine Generic Binding 8 9maintainers: 10 - Vinod Koul <vkoul@kernel.org> 11 12description: 13 Generic binding to provide a way for a driver using DMA Engine to 14 retrieve the DMA request or channel information that goes from a 15 hardware device to a DMA controller. 16 17select: false 18 19properties: 20 "#dma-cells": 21 minimum: 1 22 # Should be enough 23 maximum: 255 24 description: 25 Used to provide DMA controller specific information. 26 27 dma-channel-mask: 28 $ref: /schemas/types.yaml#definitions/uint32 29 description: 30 Bitmask of available DMA channels in ascending order that are 31 not reserved by firmware and are available to the 32 kernel. i.e. first channel corresponds to LSB. 33 34 dma-channels: 35 $ref: /schemas/types.yaml#definitions/uint32 36 description: 37 Number of DMA channels supported by the controller. 38 39 dma-requests: 40 $ref: /schemas/types.yaml#definitions/uint32 41 description: 42 Number of DMA request signals supported by the controller. 43 44required: 45 - "#dma-cells" 46